Pipe-threading machine.



PATENTED R. 21, 1908; H. a. PETERSON.

PIPE THREADING MACHINE. I .Q'PLIOATIOF TIL ED JUN; 17, 1907.

INVENTOR I i I 77 .E'Pez'eraazz f By I I I R is PETERS cm. wasmncwn, n. c.

HERMAN L. E. PETERSON, OF ELGIN, ILLINOIS.

PIPE-THREADING MACHINE.

Specification of Letters Patent.

Patented April 21, 1908.

Application filed June 17, 1907. Serial No. 379,460.

To all whom it may concern:

Be it known that I, HERMAN L'. ErPETER- SON, a citizen of the United States, residing at Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Pipe-Threading Machines, of which the following is a specification, reference being had therem to t e accompanying drawing.

This invention relates to improvements in pipe threading machines, and particularly to an attachment for preventing the stock or die-head from rotating backward as the operator is operatin the machine.

The object of t e invention is the peculiar construction of a pawl or dog attachment for a pipe threading machine.

ith these and other objects in view, the invention consists of certain novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings: Figure 1 is a bottom view of a pi e threading machine of any ordinary type, s owing my improved attachment applied thereto. Fig. 2 is a View in side elevation of the structure depicted in Fig. 1. Fig. 3 is a perspective view of the elements or members of my improved attachment. Fig. 4 is a perspective view of the spring of my attachment, and Fig. 5 is a side view of the dog or pawl.

Referring to the accom anying drawings,- 1 designates the frame 0' an ordinarymachine for cutting taperin threads upon a ipe. The pins 2 are fixed y secured at their Power ends to the frame 1, and o erably engage, at their upper ends, suita le dies or chasers 3. The work holder 4 is provided with a fixed gear wheel 5, and meshing with said gear wheel 5 is a pinion 6, which is actuated through the medium of the vertical shaft 7. When the ear wheel 5 is rotated, the work-holder 4 wi 1 be threaded upon the internal sleeve 7, thereby causing the pins 2 to be forcedupward, and consequently permitting the dies or chasers 3 to recede from the pipe being threaded, and gradually diminish the depth of the thread being cut. I do. not speclfically describe the ordinary structure of a ipe-threading machine, to which my 'attac 'ment is to be applied, because the structure is common in the prior art.

I wish it to be understood that my structure consists of a spring pawl 8, to be used in spring is engaging t I connection with the gear wheel 5 and pinion 6, said awl being provided with a boss or hub 9, having two flat bearing surfaces 10 and 11, formed at right-angles with each other so as to provide a cut-away corner as clearly seen in Figs. 3 and 5. The boss or hub is apertured, as at 12, and extending through the apertured portion 12 of the boss, is a bolt 13, by means of which the pawl 8 is detachably secured to the frame 1. It is to be noted that the boss or hub 9 is secured in engagement with the frame 1 by threading an ordinary nut 14, upon the upper threaded end of the bolt 13. The outer end 15 of the pawl 8 normally engages the teeth of gear wheel 5 for preventing said gear Wheel from rotating in one direction.

A spring 15 is employed for holding the pawl 8 normally in engagement with the teeth of gear wheel 5, and said spring comprises a primary portion 16 and an auxiliary portion 17. The auxiliary portion 17 is formed by bending back a portion of the primary portion 16 substantially parallel therewith. On the auxiliary portion 17, and, preferably, near the meeting ends of portions 16 and 17, is a vertical, integral lug or spur 18, which normally extends into a suitable recess formed in the frame 1. A screw 19 is positioned between portions 16 and 17 of the spring 15, and is threaded into an aperture formed in frame 1. and the screw 19, the spring 15 is detachably secured to the frame 1. The spring 15 is not permitted to pivot or move, thereby producing an eflicient structure, because it will, at all times, exert sufficient pressure upon one of the flat faces of the boss or lug for holding the pawl either in engagement with the teeth of t e gear wheel or away from the same. For instance, if the primary portion 1.6 of the 8, as in Fig. 3, the pawl will be held in engagement with the teeth of said gear wheel 5, whereas, if it is undesirable to have the pawl 8 engage said gear wheel, by swinging the pawl outward upon the bolt 13 and causing the primary portion 16 of the spring to engage the flat face 11, the awl 8 will be held away from said gear whee I have found from practical experience that my attachment is of great importance in preventing any lost motion when threading a pipe, as the gear wheel 5 can not rotate backward when a machine, provided with my attachment, is being operated by one person.

By means of the lug 18 e flat face 11 of the pawl Furthermore, the peculiar structure of the lock the rotary carrier or unlock the same, 10 pawl and spring produces a highly efiicient substantially as specified.

device, for the purpose desired. In testimony whereof I hereunto aflix my What I claim is: signature in presence of two witnesses I A die-stock having a rotary (ll6-Cfi11161, HERMAN L E PETERSON gear teeth on said die-carrier, a pinion having teeth in engagement with the gear teeth on Witnesses:

the carrier, means whereby the pinion may LURA KINGsLEY, be rotated, and a locking device adapted to FRANK W. JosLYN. 

